package com.akino.gulimall.cart.interceptor;

import com.akino.common.constant.AuthServerConstant;
import com.akino.common.constant.CartConstant;
import com.akino.common.vo.MemberRespVo;
import com.akino.gulimall.cart.vo.UserInfoTo;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * @author Akino
 * @version 1.0
 * 拦截器
 * 在执行目标方法之前，判断用户的登陆状态，并封装传递给controller目标请求
 */
//@Component
public class CartInterceptor implements HandlerInterceptor {
    public static ThreadLocal<UserInfoTo> threadLocal = new ThreadLocal<>();
    /**
     * 目标方法执行之前拦截
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoTo userInfoTo = new UserInfoTo();
        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo)session.getAttribute(AuthServerConstant.LOGIN_USER); // 在session中获取loginUser
        if (member != null){   // session中存在loginUser
            // 用户已经登陆，将用户的id存入userInfoTo
            userInfoTo.setUserId(member.getId());
        }
        Cookie[] cookies = request.getCookies();
        if (cookies!=null &&cookies.length>0){
            for (Cookie cookie :cookies) {
                // 拿到user-key
                String name = cookie.getName();
                if (CartConstant.TEMP_USER_COOKIE_NAME.equals(name)){
                    userInfoTo.setUserKey(name);
                    userInfoTo.setTempUser(true);
                }
            }
        }
        // 如果没有临时用户，就自定义临时用户
        if (StringUtils.isEmpty(userInfoTo.getUserKey())){
            String uuid = UUID.randomUUID().toString();
            userInfoTo.setUserKey(uuid);
        }
        threadLocal.set(userInfoTo); // 同一线程共享数据
        return true;
    }

    /**
     * 业务执行之后，分配临时用户，让浏览器保存
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoTo userInfoTo = threadLocal.get();
        if (!userInfoTo.getTempUser()){
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoTo.getUserKey());
            cookie.setDomain("gulimall.com"); // 设定作用域
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT); // 设定过期时间
            response.addCookie(cookie);
        }
    }
}
